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  • Which useful alternative control structures do you know?

    - by bigown
    Similar question was closed on SO. Sometimes when we're programming, we find that some particular control structure would be very useful to us, but is not directly available in our programming language. What alternative control structures do you think are a useful way of organizing computation? The goal here is to get new ways of thinking about structuring code, in order to improve chunking and reasoning. You can create a wishful syntax/semantic not available now or cite a less known control structure on an existent programming language. Answers should give ideas for a new programming language or enhancing an actual language. Think of this as brainstorming, so post something you think is a crazy idea but it can be viable in some scenario. It's about imperative programming.

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  • An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll

    - by Tanner
    OK, Im trying to highlight keywords in a richtextbox, the problem is I've got the code to highlight only the visible text on textChanged event,so I tryed putting the code in the richtextbox VScroll, so when I scrolled up it would highlight the text that wasn't visible before, but every time I start to scroll I get this error: "An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll" Does any one know why? Or maybe a way I could highlight the words while scrolling? Thanks, Tanner. int selectionstart = richTextBox1.Selectionstart; int topIndex = richTextBox1.GetCharIndexFromPosition(new Point(1, 1));//This is where I get the error. int bottomIndex = richTextBox1.GetCharIndexFromPosition(new Point(1, richTextBox1.Height - 1)); int topLine = richTextBox1.GetLineFromCharIndex(topIndex); int bottomLine = richTextBox1.GetLineFromCharIndex(bottomIndex); int start = richTextBox1.GetFirstCharIndexFromLine(topLine); int end = richTextBox1.GetFirstCharIndexFromLine(bottomLine); int numLinesDisplayed = (bottomLine - topLine) + 2; richTextBox1.Focus(); richTextBox1.Select(start, end);

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  • Maven 2.1.0 not passing on system properties to Java virtual machine

    - by raisercostin
    We use the command line to pass on system properties to the Java virtual machine when running our Hudson builds on a Linux box. It used to work quite well in 2.0.9 by since we upgraded to 2.1.0 it has stopped working altogether. The system properties just never make it to the Java virtual machine. I have created a small test project and indeed it does not work at all. I have attached it in case you want to give it a go. This should work just fine with Maven 2.0.9: mvn2.0.9 -Dsystem.test.property=test test But this will fail: mvn2.1 -Dsystem.test.property=test test The Java code simply does this assertTrue( System.getProperty("system.test.property") != null); , Apr 20, 2009; 12:44pm edward eric pedersson

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  • System Slow After Uprading Ubuntu

    - by Aragon N
    i have an ubuntu network machine which has release of 10.04.1 LTS Lucid. on this system i have apache, postgresql and django. for some app. development i have to install php and php-curl... due to being on network, i have exported wmvare machine to internet and firstly i have upgraded system and then install php5 packages on it. After all replacing it with its old place, i have considered that the new system query is some slow according to another. Old system query time : 140 ms New system query time : 9.11 s i have checked /etc/network interface and it seems there is no problem. i have checked /etc/resolv.conf and it seems ok i have checked /etc/nsswitch.conf and only host section is different from old one which old system has hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 and then i have checked time host -t A services.myapp.com and i got real 0m0.355s user 0m0.010s sys 0m0.020s and now what can i have to check for boosting my system as before?

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  • How do I make Geany my default editor on Ubuntu?

    - by Programming Noob
    I actually want to change the default text editor on my Ubuntu 12.04 from nano to Geany. When I used this code: update-alternatives --config editor .. I don't see Geany in the list. So to add Geany, this is supposed to work right? update-alternatives --install /usr/bin/geany geany /usr/bin/geany 10 Also, on a side note, can you tell me if you would personally suggest me to change the default editor from nano to Geany, and why?

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  • Which programming language to get into?

    - by user602479
    I'm ending my third term in a few weeks so I have some spare time coming up. I'd like to spend it seriously digging into programming. My problem: I'm not sure which language to begin with. Just to be clear, I don't want to start a language-y-compared-to-language-z discussion. There are a some other issues that play a major role. In my 5th term I'm going to be participating in a major practical course which will include either Java or C programming. It will take a lot of time and energy, as I found out while talking to a few students who passed the final exams (only 15% pass on their first try). Which practical course I will take is randomly decided. My skills so far are the absolute basics of Java and C programming. I know the different data types and how to handle them, objects, pointers, thread programming, etc. All of that is on a very low level, though. My question now is, what language should I start seriously practicing? Java: I did my first GUIs with this language. I'm familiar with Eclipse but I need a project to work on (which I don't have) to really keep me pushing. Besides that, I don't think it would help me if I have to do C in a year. C: As with Java, I can't think of a personal project to keep me working and keep me interested in programming. If I get assigned to Java in a year, this wouldn't give me any advantages either, would it? (No objects, etc.) Objective-C: I recently came up with this idea. I have a Mac; I'm not really familiar with Xcode but I have one or two personal projects I'd like to work on. Further, I would be working with objects (as in Java) and C language constructs which would both be great for this practical course in a year. What do you think I should begin with? Should I just stick to Java and hope for the best, force myself through C or start (nearly) completely from the beginning with Objective C? Maybe you folks could give me some good advice that would stop me from switching from one language to the next?

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  • What are the system requirements for each flavor of Ubuntu Desktop?

    - by Braiam
    I'm thinking about installing Ubuntu Desktop, but I don't know what flavor is the better for my system. What are the minimum and recommended hardware requirements? What kind of CPU? How much memory? Should I have Hardware Acceleration? What flavor should I use? This is an attempt of a canonical answer. My answers have the "official minimal requirements", the recommended are a mix of official sources and opinion based (along with the answer it's told the source). You can comment or edit if you feel that the information is obsolete or incomplete. Is a good rule of thumb that any system capable to run Windows Vista, 7, 8 x86 OS X will almost always be a lot faster with any Ubuntu flavor even if they are lower-spec than described below.

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  • Imperative vs. component based programming [closed]

    - by AlexW
    I've been thinking about how programming and more specifically the teaching of programming is advocated amongst the community (online). Often I've heard that Ruby and RoR is an ideal platform for learning to program. I completely disagree... RoR and Ruby are based on the application of the component based paradigm, which means they are ideal for rapid application development. This is much like the MVC model in PHP and ASP.NET But, learning a proper imperative language like Java or C/C++ (or even Perl and PHP) is the only way for a new programmer to explore logic itself, and not get too bogged down in architectural concerns like the need for separation of concerns, and the preference for components. Maybe it's a personal preference thing. I rather think that the most interesting aspects to programming are the procedural bits of code I write that actually do stuff rather than the project planning, and modelling that comes about from fully object oriented engineering or simply using the MVC model. I know this may sound confused to some of you. I feel strongly though that the best way for programming to be taught is through imperative and procedural methods. Architectural (component) methods come later, if at all. After all, none of the amazing algorithms that exist were based on OOP practice! It's all procedural code when it comes to the 'magic'. OOP is useful in creating products and utilities. Algorithms are what makes things happen, and move data around, and so imperative (and/or procedural) code are what matters most. When I see programmers recommending Ruby on Rails to newbie developers, I think it's just so wrong. Just because you write less code with Ruby does not make it easier to do! It's the opposite... you have to know loads more to appreciate its succinct nature. New coders who really want to understand the nuts and bolts of coding need to go away and figure out writing methods/functions (i.e. imperative programming) and working in procedural style, in order to grasp the fundamentals, first, before looking into architectural ways of working. So, my question is: should Ruby ever be recommended as a first language? I think no (obviously)... what arguments are there for it?

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  • How to understand the programming of an operating system

    - by piemesons
    Hello, I want to learn the operating system. How it works. I don't want to make my own operating system. I just want to learn how it works. As I can find out source code of any open source OS. But how to start. Like starting from the first elementary kernel (whatever it is). Somebody suggested I try to implement Linux from scratch etc. Please guide me in a proper way. I want to know about the proper path to follow. I am ready to invest three to four years just to understand the basics. I have good fundamentals of C, C++, PHP, OOP and compiler design.

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  • Is there a way of leveling/compressing the sound system-wide?

    - by JethroDawnfine
    As a Laptop user, I'm sure that a lot of people, even the ones using Netbooks would have already gone through this problem. Especially when listening to podcasts, and using it as an example, the sound might have loud moments and quiet moments, one person speaking loud and the other speaking very quiet in the same episode. Thereby, I always wanted the sound to be compressed system-wide, and I just noted the other day, that in Windows, some Realtek drivers already offer this function. We have already a pulseaudio plugin for equalization system-wide, and although it still has problems like not letting us change its values and listen the change in real time, or cracking the sound while changing pulse volume, I do love it and use it. Now I'm just missing something to keep the sound around 0db (or near the volume level you're using) as a leveler plugin for pulseaudio. Any suggestion?

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  • System freezes during boot process

    - by slugster
    Hi everyone, i have a machine running Win7 Ultimate. It was running fine, then it just froze - all the stuff i was doing was still on the screen, but mouse and keyboard input was ignored, any animation that was happening on the screen stopped, the machine literally just froze. So i rebooted (power off button), from then on the machine will reboot, but it ultimately freezes again. The instance when this happens will vary - i have made it as far as the Windows login screen, but mostly it will do the POST, then give me the option to press F1 to continue or Del to enter BIOS settings (but of course pressing a key has no effect - it's frozen!). I have disconnected everything not necessary for the boot process, the only peripheral that remains attached is the keyboard. (even the network cable is disconnected). Prior to this the machine was operating fine. The install of Win7 is only 2 days old, and it was a fresh reinstall (i.e. not an upgrade or repair). Can anyone give me an indication of what may be wrong here? I'm not sure if this question should be here or on SuperUser, please migrate it if i have chosen the wrong board.

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  • System freezes during boot process

    - by slugster
    Hi everyone, i have a machine running Win7 Ultimate. It was running fine, then it just froze - all the stuff i was doing was still on the screen, but mouse and keyboard input was ignored, any animation that was happening on the screen stopped, the machine literally just froze. So i rebooted (power off button), from then on the machine will reboot, but it ultimately freezes again. The instance when this happens will vary - i have made it as far as the Windows login screen, but mostly it will do the POST, then give me the option to press F1 to continue or Del to enter BIOS settings (but of course pressing a key has no effect - it's frozen!). I have disconnected everything not necessary for the boot process, the only peripheral that remains attached is the keyboard. (even the network cable is disconnected). Prior to this the machine was operating fine. The install of Win7 is only 2 days old, and it was a fresh reinstall (i.e. not an upgrade or repair). Can anyone give me an indication of what may be wrong here? I'm not sure if this question should be here or on SuperUser, please migrate it if i have chosen the wrong board.

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  • Which hardware changes require operating system reinstallation?

    - by Mark
    I'm about to upgrade my computer but might keep some parts. Just wandering what I would have to keep to prevent me having to reinstall my OSs, at the moment I have a dual boot setup with ubuntu and windows 7. I'm pretty sure you can't just take your hard drive with the OS on it and put it into a different box and keep going (can you?) but I know you can change the graphics cards, secondary hard drives and ram with out a problem. So what is it that you can't change? The CPU? Motherboard? Thanks for any replies

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  • System Center Configuration Manager 2007 - Debugging Client Installs

    - by Dayton Brown
    Hi All: Having an issue installing the CCMsetup client on desktops. The CCMSetup makes it to the PC, files are there, it gets added to the services for automatic start, it starts, but quits almost instantly. Logs on the desktop show a entry like this. <![LOG[Failed to successfully complete HTTP request. (StatusCode at WinHttpQueryHeaders: 404)]LOG]!><time="14:28:51.183+240" date="06-11-2009" component="ccmsetup" context="" type="3" thread="2388" file="ccmsetup.cpp:5808"> What am I missing? EDIT: Firewall is off on both client and server.

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  • How to get partition information from non-booting server?

    - by gravyface
    Need to manually rebuild a mirrored array on a server and am in the process of reinstalling SBS 2003 on it. However, it's a Dell server, and know that there's the Dell FAT32 diagnostics partition, a system partition, and a data partition, but do not know the size of each. Planning on reinstalling SBS 2003, all applications on the server, and then doing a System State restore, but figured that not having the correct partitions will cause some grief: am I right? Almost thinking that the size of the partitions shouldn't matter, but not positive. Question: should I care about the size of the partition? If so, how can I get this partition information from a non-booting drive? We have an Acronis image of the one working disk and the partitions are mounted/viewable in Explorer on a workstation, but I'm not sure where the Logical Disk Manager/Disk Management data is stored and/or if there's a way to retrieve it without having a working Windows installation.

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  • What is the difference between sar -B verses sar -W

    - by Mark
    I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following: What is the correlation between the two sets of statistics. When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with? Which statistic is more closely related to system performance Thanks

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